Mask tightness test: is a quick breath enough?

Mask tightness test: is a quick breath enough?

1. Definition of tightness. 

If the fit of the mask is poor, it will not help even if it has KN99 filtration efficiency. The outside air can enter directly from the poorly fitted periphery without passing through the mask filter material, so the good or bad fit directly affects the safety of the user.

 

2. Technical requirements of tightness

If the fit of the mask is poor, it will not help even if it has KN99 filtration efficiency. The outside air can enter directly from the poorly fitted periphery without passing through the mask filter material, so the good or bad fit directly affects the safety of the user.

 

3. Technical requirements of tightness

Through the fit test penetration, we can check how well it fits and whether it can be fitted to the face after wearing it. As a hospital inductor, when we train or evaluate medical staff to wear masks, we will ask them to cover the mask with their hands after wearing the mask and breathe quickly to see if there is any leakage of the mask, so as to test the tightness of the mask easily. But how to evaluate the tightness of the mask is a very subjective feeling?

 

4. Test method of tightness

In professional testing institutions, masks are tested in this way! Medical protective masks need to be tested by real people in the test chamber, and particle counters are used to test the concentration of the number of particles; the protective effect of non-medical masks is tested by head models instead of real people, and breathing simulators are used to simulate the breathing process.

 

In summary, it can be seen that different shapes of masks have different effects on the tightness, and there is no mask that fits perfectly to every face.